As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING WORK CARD T/C 7827300 FOUND MESSAGE NUMBER 73 20312. THE START SWITCH SIGNAL AND AIRINC DATA BUS DISAGREE SHORT TIME FAULT NR 2 ENGINE. PERFORMED FIM 73 24 00 810 813 AND REMOVED AND REPLACED ENGINE START SWITCH AND TEST GOOD IAW AMM 80 11 00.